refactor(purchase): 优化采购订单查询的动态SQL逻辑

- 将原有的静态字段映射改为根据表名动态选择字段
- 使用choose/when替代if条件判断，提高SQL的可读性
- 重构了bu_todo和bu_todo_completed表的查询逻辑
- 移除了重复的approve_user条件过滤
- 优化了已完成任务表的聚合查询，使用max函数获取最新审批时间

ruoyi-sip/src/main/resources/mapper/sip/OmsPurchaseOrderMapper.xml

@@ -116,18 +116,49 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
         , t1.status, t1.approve_status, t1.approve_time, t1.approve_node, t1.confirm_status, t1.create_time, t1.update_time, t1.del_flag,t1.version
         , t1.file_id
         ,t2.vendor_name,t2.vendor_user,t2.vendor_phone
+
+        <choose>
+            <when test="'bu_todo'.equals(tableName)">
                 ,t3.apply_time,t3.process_key,t3.todo_id,t3.task_id
-        <if test="'bu_todo_completed'.equals(tableName)">
-            ,t3.approve_time as todo_approve_time
-        </if>
+            </when>
+             <when test="'bu_todo_completed'.equals(tableName)">
+                ,t3.apply_time,t3.approve_time  as todo_approve_time,t3.process_key
+            </when>
+        </choose>
         from oms_purchase_order t1
         left join oms_vendor_info t2 on t1.vendor_id = t2.vendor_id
-        inner join ${tableName} t3 on (t3.process_key in ('purchase_order_online') and t3.approve_user=#{entity.approveUser} and t3.task_name!='商务' and t3.business_key=t1.purchase_no)
+        inner join
+            <choose>
+                <when test="'bu_todo'.equals(tableName)">
+                  (select bt.business_key,bt.apply_time,bt.process_key,bt.todo_id,bt.task_id from bu_todo bt
+                    WHERE
+                    bt.process_key IN ('purchase_order_online')
+                    AND bt.approve_user = #{entity.approveUser}
+                    AND bt.task_name!='商务'
+                            )
+                </when>
+                 <when test="'bu_todo_completed'.equals(tableName)">
+                     (SELECT
+                     business_key,
+                     max(btc.approve_time)  approve_time,
+                     max(btc.apply_time) apply_time,
+                     max(btc.process_key) process_key
+
+                     FROM
+                     bu_todo_completed btc
+                     WHERE
+                     btc.process_key IN ('purchase_order_online')
+                     AND btc.approve_user = #{entity.approveUser}
+                     AND btc.task_name!='商务'
+                     GROUP BY business_key)
+                 </when>
+            </choose>
+            t3 on  t3.business_key=t1.purchase_no
         <where>
             <if test="entity.purchaseNo != null  and entity.purchaseNo != ''"> and t1.purchase_no = #{entity.purchaseNo}</if>
             <if test="entity.vendorName != null "> and t2.vendor_name = #{entity.vendorName}</if>
             <if test="entity.ownerName != null "> and t1.owner_name = #{entity.ownerName}</if>
-            <if test="entity.approveUser != null "> and t3.approve_user = #{entity.approveUser}</if>
+<!--            <if test="entity.approveUser != null "> and t3.approve_user = #{entity.approveUser}</if>-->
             <if test="entity.params.applyTimeStart != null and entity.params.applyTimeEnd != ''">
                 <choose>
                     <when test="entity.params.applyTimeStart != null and entity.params.applyTimeEnd != null">